<!DOCTYPE html>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<p>PASS if no crash or assertion failure.</p>
<div id="root">
    <div style="width:100px;">
        <div style="column-span:all;"></div>
    </div>
</div>
<script>
    document.body.offsetTop;
    document.getElementById("root").style.columns = "2";
</script>
